Please adjust the screw if it is not in the center, in this way, you will collimate sucessfully. Used to calibrate the optical axis of a refractor, put the collimation eyepiecre into the tube. Make sure the black spot is in the center of 2 lines of collimation eyepiece. A wonderful accessory for both photography and astronomy lovers. 1.25 inch calibration eyepiece is of short size, made of aluminum alloy.
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